![]() But your PC is behind a firewall that doesn’t allow incoming traffic to the server software.Īssuming you can access a remote SSH server, you can connect to that SSH server and use remote port forwarding. For example, let’s say you’re running a web server on the local PC you’re sitting in front of. It allows you to make a resource on your local PC available on the SSH server. “Remote port forwarding” is the opposite of local forwarding, and isn’t used as frequently. RELATED: What is SSH Agent Forwarding and How Do You Use It? Remote Port Forwarding: Make Local Resources Accessible on a Remote System You will also need to enter the address and port of the SSH server itself on the main “Session” screen before connecting, of course. Click “Add” afterwards and then click “Open” to open the SSH connection. You can use any command line or graphical tool to access the database server as if it was running on your local PC.įor example, if you wanted to set up the same SSH tunnel as above, you’d enter 8888 as the source port and localhost:1234 as the destination. The SSH server sits in the middle, forwarding traffic back and forth. So, when you attempt to access the database server at port 1234 your current PC, “localhost”, that traffic is automatically “tunneled” over the SSH connection and sent to the database server. To do this, you establish an SSH connection with the SSH server and tell the client to forward traffic from a specific port from your local PC-for example, port 1234-to the address of the database’s server and its port on the office network. This is often the case, as it’s easier to secure a single SSH server against attacks than to secure a variety of different network resources. But if you have access to an SSH server at the office, and that SSH server allows connections from outside the office network, then you can connect to that SSH server from home and access the database server as if you were in the office. For security reasons, that database server is only configured to accept connections from the local office network. For example, let’s say you want to access a database server at your office from your home. “Local port forwarding” allows you to access local network resources that aren’t exposed to the Internet. ![]() This remote IP:port will be exposed locally at 127.0.0.1:18080.Local Port Forwarding: Make Remote Resources Accessible on Your Local System In the example above, you are connecting via SSH onto and you are interested on a web frontend exposed at :8080. In this case, the -L option defines a correspondence between localhost:localport and remotehost:remoteport, as shown in the pseudo command below: ssh -L localhost:localport:remotehost:remoteport example: $ ssh -L 127.0.0.1:18080::8080 run Firefox locally: $ firefox If you have an application running remotely which exposes some sort of web frontend, you will be interested on exposing the remote IP:port as if it is a local IP:port. You can also do both steps in a single go, like shown below: $ ssh -X firefox Notice the usage of -X flag in the ssh command. If you'd like to browse the web locally as if you were sitting in front of a remote box: $ ssh -X run Firefox inside the remote terminal session: $ firefox I do not know why firefox on remotebox2 starts a remote session instead of a local session. The following command on remotebox2 starts a remote firefox session as expected. No firefox process running on the remotebox. The following command produces a brief delay, then drops back to prompt and a local firefox window pops up. The following command starts a remote firefox session with a remote firefox window. Here some more information of my local system. Why is it opening a local firefox window? How can i prevent that? If firefox is not running on my local machine then a remote firefox window will open. no firefox process is running on the remote box. Then start firefox on the remote box remotebox$ firefoxĪnd I have firefox running on my local machine, a local firefox window will open. ![]() When I SSH to a remote box $ ssh -X remotebox
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